Mass of a Whale

"The largest of all known animals, the blue whale attains a maximum length and weight of about 30 meters (100 feet) and 150 tons; the largest known individual, a female 33.58 meters (110.14 feet) in length, was reported in 1922."

"Adults weigh between 100 and 120 tonnes, as much as about 2000 people which is more than 25 elephants! Newborns weigh approximately 2.5 tonnes. The heaviest
blue whale ever recorded was a massive 190 tonnes."

100-120metric tons

Engel, Leonard. The Sea. New York: Time Inc, 1971: 148.

"This means that the record blue whale probably weighed 170 tons, as much as 2,267 150-pound human beings."

"It weighs between 100-120 tonnes, the heaviest recorded was a female weighing 200 tonnes."

100-120metric tons200metric tons

There are two different types of whales, baleen whales and toothed whales. Baleen whales are usually much larger than
toothed whales and possess baleen plates. These plates are used to filter out
small organisms from the water, which compose their diet. Whales can grow to
such huge sizes because water supports their weight against the pull of
gravity. Out of the 79 currently recognized species of cetaceans (whales, dolphins,
and porpoises), the blue whale is the largest.

Balaenoptera masculus is the largest order of whales commonly known as the blue
whale. It is the largest known creature to have ever lived growing to lengths
of 30 m and weighing as much as 180 metric tons. Balaenoptera
musculus weighs 15 times as much as the heaviest recorded elephant -- 12,200 kg.
The tongue of this enormous creature alone weighs as much as an elephant
and its heart is approximately the size of a Volkswagen Beetle, weighing
1000 kg. Its aorta is so large a person could crawl in it. On the average this monstrous creature
eats 3600 kg of food each day. An amazing feat given that
it can't swallow anything larger than an apple.

Whales mostly experience their environment in terms of sound. They use echolocation
to see their surroundings and communicate through songs. Whales communicate through
very low frequency sounds. Larger animals tend to produce lower pitched sounds
as a result of thicker vocal chords. Blue whales for example vocalize in frequencies
of 10 to 39 Hz. The humpback whale is known to be the most distinguished singer.
Its long complex melodies change with the seasons and from year to year. There
are speculations to a whale's intelligence due to its elaborate vocalizations
and huge brain size. A sperm whale's brain weighs about 9 kg and is the
largest brain in the world. In comparison an average human brain is 1.35 kg.